Our Team


CPA, Senior Manager


Amber Rathbun, CPA, Senior Manager

Amber is a senior manager in Maner Costerisan’s Tax department. She joined the firm in 2014, shortly after graduating from Michigan State University. Prior to joining Maner Costerisan full-time, she had accounting and tax internships in the Lansing area. As part of her daily responsibilities, Amber provides tax support to individuals, nonprofits, and for-profit businesses.

As an active member of the firm’s Nonprofit team, Amber appreciates the opportunity to learn continuously. She gives presentations and training to clients and internal staff members and provides tax compliance and consulting support to nonprofit clients so they can focus on carrying out their mission.

Amber loves working at Maner because it offers a family feel while providing tremendous growth opportunities. The firm’s countless resources and talented team help push her to continue to become the strongest professional she can be. Amber enjoys the work she does and the people she works with daily.

A graduate of Michigan State University with a Bachelor of Arts in Accounting and a Master of Science in Accounting, Amber is passionate about music and animals. She enjoys singing and playing an instrument and has plenty of scenery nearby for birdwatching and observing other wildlife. Amber and her husband moved from Lansing to southern Georgia in 2021, where they currently reside with their cat, Honey, and two dogs, Franklin and Rio.

Trust your instincts and continue to step out of your comfort zone because that's how you grow and learn. I'm proud to work for a firm that challenges employees and constantly strives to deliver quality products and advisory services.

Years of Experience



American Institute of Certified Public Accountants (AICPA)

Michigan Association of Certified Public Accountants (CPA)


Certified Public Accountant (CPA)

AICPA Not-for-Profit Certificate II